Malicious PDF — malware analysis report

Static analysis result for SHA-256 d016f14e2ffacd97…

MALICIOUS

PDF

81.3 KB Created: 2021-09-20 19:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bce148a5bc0eb77e274146182905a2fd SHA-1: 0faae58e40619523375d7c09c79466f803b27872 SHA-256: d016f14e2ffacd97898e95fa4baf50474df76af3757b3a2b9e59f42f52d8289a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings confirm the link farm nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pixomot.ru/uplcv?utm_term=change+model+number+android PDF link annotation
    • http://studiopol.it/userfiles/files/mizitimumin.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/qb0ip513eqb0vqbhp5uevm8t0v/mututikuwakizofifipon.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8e2ba3ef6---69364771516.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/xemisevufuwinitatukuzure.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/32602918951.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16139d19dc9f26---kebinikidajupololovosajed.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/mejibalidam.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/90163714936.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/datotuxotadisirokomilet.pdfIn PDF document text
    • http://eternaseguros.net/files/files/zoluxekakovezarezebunara.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/78072949333.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/giponovu.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/60657863286.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/banepunibomedasusigep.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161368256143a7---zuwoluwol.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/xuzetatibekutat.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/rajirudo.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/76927175492.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/lufipak.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613349d2b43fa---renukasejowogorarekiwezir.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/68909831052.pdfIn PDF document text
    • http://e-menu.hu/editor_up/93994520930.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/59201848514.pdfIn PDF document text
    • https://tcremich.lu/files/files/66889456396.pdfIn PDF document text
    • http://agro-partner.com/Image/files/47954845057.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/bebedaguvotupuka.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA48 17648 bytes
SHA-256: 304f0aecdccecb2ec7c83cdc902430f7d729f1bd6fa39cbabd47d7fc6c543f37
font_01_sfnt_off000107ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC4 10700 bytes
SHA-256: 2d2a183c4e4c34998bcfe843d744e68f0472f822bee3ed07a22fe79a8d746245

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